Multiple Choice
Which of the following is NOT an example of a molecular formula?
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3. Chemical Reactions
Molecular Formula
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Which of the following chemical compounds is the main component of dry ice?
A
NaCl
B
H2O
C
CH4
D
CO2
Verified step by step guidance1
Understand what dry ice is: Dry ice is the solid form of a gas commonly used for cooling purposes without melting into a liquid.
Recall the common substances listed: NaCl (table salt), H2O (water), CH4 (methane), and CO2 (carbon dioxide).
Identify which of these substances can exist as a solid at relatively low temperatures and sublimate directly from solid to gas without becoming liquid under atmospheric pressure.
Recognize that CO2 is known to form dry ice, which sublimates at -78.5°C, making it the main component of dry ice.
Conclude that among the options, CO2 is the correct answer because it is the chemical compound that forms dry ice.
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